Strict Word64 Compiler Panic

[Simon Marlow]

> Let Crash.hs be:
> 
> module Crash where
> import Data.Word (Word64)
> data S = S { a :: ! Word64 }
> s :: S
> s = S { a = 0 }
> 
> Then:
> 
> (mbs at emae) ghci-5.04 -fglasgow-exts
>    ___         ___ _
>   / _ \ /\  /\/ __(_)
>  / /_\// /_/ / /  | |      GHC Interactive, version 5.04, for 
> Haskell 98.
> / /_\\/ __  / /___| |      http://www.haskell.org/ghc/
> \____/\/ /_/\____/|_|      Type :? for help.
> 
> Loading package base ... linking ... done.
> Loading package haskell98 ... linking ... done.
> Prelude> :l Crash
> Compiling Crash            ( Crash.hs, interpreted )
> ghc-5.04: panic! (the `impossible' happened, GHC version 5.04):
>         ByteCodeGen.mkUnpackCode LW_

Thanks for the report.  This is now fixed in CVS, but the fixes are too
difficult to unpick from other changes in GHCi so we probably won't
back-port the fix to the 5.04 branch.

Cheers,
	Simon